Solve the following pair of linear equations by the substitution method. 0.2x + 0.5y = − 0.5 and 0.5 x + 0.3y = −2.2
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so this question's answer is x=-0.5 and y= 1
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Is (–5, 0.5) a solution of this system?
x – 4y = –7,
0.2x + 2y = 0
Substitute (–5, 0.5) into x – 4y = –7 to get
✔ –5 – 4(0.5) = –7
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Substitute (–5, 0.5) into 0.2x + 2y = 0 to get
✔ 0.2(–5) + 2(0.5) = 0
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Simplify the above equations to get
✔ –7 = –7 is true and 0 = 0 is true; a solution.
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