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netineya [11]
3 years ago
15

Someone help me with this ples with steps

Mathematics
1 answer:
SSSSS [86.1K]3 years ago
4 0

Answer:

x=\frac{21}{4}

y=\frac{21}{2}

Step-by-step explanation:

equation (1): \frac{1}{2} (2x+y)=\frac{21}{2}

equation (2): y=2x

solve the system by substitution

step1: sub (2x) for y in equation 1:

\frac{1}{2} (2x+y)=\frac{21}{2}

\frac{1}{2} (2x+2x)=\frac{21}{2}

step2: simplify the expression:

\frac{1}{2} (4x)=\frac{21}{2}

2x=\frac{21}{2}

(divide by 2 for both sides)

x=\frac{21}{4}

To find the value for y sub 21/4 for x in equation 2:

y=2x

y=2×(21/4)

y=\frac{21}{2}

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