Angle : If two line segments (or rays) both start at a common point the opening between the two line segments is called an angle. The common point is called vertex of the angle. The size of an angle is measured in degrees.

Corner : A corner of a shape is a point in the shape such that this point does not lie on the line segment between any two other points in the shape. Every triangle has 3 corners and every quadrilateral has 4 corners.

Number : A number $x$ is a mathematical symbol representing a quantity.

Quadrilateral : A quadrilateral or quadrangle is a polygon with four corners. Rectangles, trapezoids, kites, rhombuses, squares and parallelograms are all specific kinds of quadrilaterals. The sum of the interior angles in a quadrilateral is always $360^{\circ}.$

The number of angles in a quadrilateral is the same as the number of corners as every corner corresponds to exactly one angle.

The correct answer is 4. A quadrilateral has 4 angles.

Denominator : The denominator of a fraction $\frac{a}{b}$ is the number $b$ below the fraction bar.

Equivalent fraction : Equivalent fractions are fractions that represent the same number. For example the fractions $\frac{1}{2}$ and $\frac{2}{4}$ are equivalent. One can create equivalent fractions of a fraction by multiplying or dividing both the numerator and the denominator of the fraction by the same non-zero number.

Fraction : A fraction is a number that can be written as $\frac{a}{b}$ with an integer $a$ and a natural numbers $b.$ A fraction $\frac{a}{b}$ is the result of the division $a\div b.$ Examples of fractions are $\frac{1}{2}, -\frac{2}{3}$ and $\frac{3}{2}.$

Half : A Half is the number equal to $\frac{1}{2}=0.5.$

Quarter : One quarter is the number $\frac{1}{4}=0.25.$

Reduced fraction : A reduced fraction (or simplified fraction or fraction in simplified form or fraction in simplest form) is a fraction $\frac{a}{b}$ such that $a$ and $b$ do not have any common factors bigger than 1. For example the reduced fraction of the fraction $\frac{4}{6}$ is $\frac{2}{3}.$

Write both fractions as equivalent fractions with denominator 4.

The correct answer is 3/4. $\frac{1}{2}+\frac{1}{4}=\frac{2}{4}+\frac{1}{4}=\frac{3}{4}$

Addition : Addition is the mathematical operation that describes increasing a number by an amount equal to a second number. The mathematical symbol for addition is the plus sign $+.$ The term addition is also used for a generalization of this basic operation on numbers to functions, vectors and matrices.

Equation : An equation is a mathematical statement in which two expressions are written with an equal sign in between. A solution of an equation is a set of variables that makes the statement a true statement.

Expression : An expression is a succession of constants, variables and mathematical operations that if evaluated for specific values of the variables represents a number.

Linear equation : A linear equation is an equation that is equivalent to the equation $mx+b=0.$ A linear equation with $m\neq 0$ has exactly the solution $x=\frac{-b}{m}$

Multiple : A multiple of a number $x$ is any of the numbers $1x,2x,3x,4x,\ldots.$ For example the multiples of 7 include 7, 14, 21 and 70.

Multiplication : Multiplication is the mathematical operation that is a shorthand for adding the same amount several times. For example $3\cdot 4=4+4+4=12.$

Solution : A solution to an equation is a choice of variables that when substituted into the equation results in a true statement.

Substitution : A substitution is replacing a term or variable with another term or variable. For example when solving a two-dimensional linear equation, one can solve the first equation for one variable and then substitute that expression for that variable in the second variable to get a linear equation only involving one variable.

Subtraction : Subtraction is the mathematical operation that describes decreasing a number by an amount equal to a second number. The mathematical symbol for subtraction is the minus sign $-.$ The term subtraction is also used for a generalization of this basic operation on numbers to functions, vectors and matrices.

Variable : A letter in an expression or function that represents an arbitrary number.

Solve either equation for $x$ or $y$ and substitute the resulting expression into the second equation. You can also multiply one of the equations by some multiple and then add or subtract the resulting equation to/from the other equation trying to generate an equation that has only one of the variables $x$ or $y$ in it. Then solve this linear equation with one variable.

The correct answer is 2,2. We can verify that $x=2$ and $y=2$ solve both equations simultaneously: $2\cdot2+1\cdot2=6$ and $3\cdot2-2\cdot2=2.$